Hey, sorry for bumping this, but there is a lot going about Aquanox Deep Descent, so I played AN1 and A2 after a long time to bring back memories. I was just messing around in AN2 and find this by accident:

There is a bonus objective for mission "Intrepido"!After you take out the 3 ships, Goons will wait you at the NAV point. Don't go there! Head back to Brainfire (North - NorthWest) and wait a bit. 5 more TZ-Intrepido ships will come eventually and you can take them out too. For a weird reason they won't fight back, they just going South pretty fast. After the last one is destroyed you will see "Bonus objective achieved: Destroy second Intrepido wave", and Goons will say "Man, you are clever! Great idea covering our tracks like that... and worth a bonus." Sadly the result screen will still show 0/0 bonuses - and you won't get anything. There is another bugged bonus objective in Vastian Griegh - which is commonly known I guess, but this Intrepido one seems to be a new find! I wonder how much more we are missing

I played it, really-really long ago, and I love it, lot of content in that game! Actually I'm not new here, I made some post in 2010 (initially with 'flaminflamin' username, but the password was lost.) I made some uploads with pictures of ships and bonus objectives walkthrough videos of AN2 which were taken off YouTube a long ago, but I found them on my dusty old PC! The videos are quite low quality unfortunately.